Inverse Seesaw in NMSSM and 126 GeV Higgs Boson

TL;DR

This paper explores an extension of the NMSSM incorporating an inverse seesaw mechanism at TeV scale, which can naturally produce a 126 GeV Higgs and enhance diphoton decay rates, addressing the little hierarchy problem.

Contribution

It introduces a novel inverse seesaw extension of NMSSM that explains neutrino masses and enhances Higgs mass and decay properties without extreme parameter tuning.

Findings

Achieves a 126 GeV Higgs with TeV scale new particles.

Enhances Higgs diphoton decay rate.

Addresses the little hierarchy problem without maximal NMSSM couplings.

Abstract

We consider extensions of the next-to-minimal supersymmetric model (NMSSM) in which the observed neutrino masses are generated through a TeV scale inverse seesaw mechanism. The new particles associated with this mechanism can have sizable couplings to the Higgs field which can yield a large contribution to the mass of the lightest CP-even Higgs boson. With this new contribution, a 126 GeV Higgs is possible along with order of 200 GeV masses for the stop quarks for a broad range of \tan\beta. The Higgs production and decay in the diphoton channel can be enhanced due to this new contribution. It is also possible to solve the little hierarchy problem in this model without invoking a maximal value for the NMSSM trilinear coupling and without severe restrictions on the value of \tan\beta.